Process of paper manufacture



oct. l1, 1932. w, SERVER PRocEss oF PAPER MANUFACTURE Filed Jan. 22, 195o .Hari

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BY/\/v WW Ar'fo RNEYq NNN Yum Patented Oct. 11, 1932 UNITED srAlrEs HERBERT W. SERVER, or DAYTON, omo

rRooEss or PAPER MANUFAQTURE y Application filed January 1930. Serial No. 422,502.

i My invention relates to a process of paper manufacture.

' It is aparticular object'of my process to in the machine, thereby increasing the rate i IU of production of the paper.

It is a further object to provide a ypaper of better printing quality as well as of greater strength. y Y Y It is an especial object of my invention to 15 provide a paper through my new process in which amaterial saving in cost in bleaching materials, such as bleaching chlorine, will be effected.

It is an object to provide a process in which al it is possible to omit bleached sulphite entirely.

It is an object toget a brighter and betterv color to theiinished sheet of paper.

Referring to the drawing:

Figure 1 is a diagrammatic perspectiveof the apparatus whichmay be employed as a ltypical installation for the practice of my process, but it will be understood that other forms and arrangements of apparatus may be employed;

Figure 2V is a vertical section through two of the several bleaching towers.

Referring to the drawingin detail, it is a any place in the process of manufacture of paper from the primary beater to the exit of the stock from the rotary screens prior to entry into thebleaching towers or into the stream entering the bleaching towers.'l

I have shown in Figure 1 a preferred form of introducing the raw sulphite or raw sulphate in its unbleached condition but do not desire to be confined to that arrangement.

Referring to the drawing in detail, 1 is a beater in which is introducedpaper stock,

such as magazine stock. Heretofore, it hasvl been the practice to also introduce the more expensive ledger stock lin order to give strength and lsuperior printing surface to v y fifi the resulting product.V In the present process, it is possible to eliminate ledger stock entirely. In the previous process, diculty hasalways `been found inthe manufacture of paper from such stock that the'fibers wereo so fine or short, or both, that they made a very dense paper stock from which the water would not flow readily and, therefore, necessitated a. relatively slow production. They length of the fibers in such paper was Vrela-t0 tively short and, therefore, the paper was relatively weak.

It is lnow the practice to putY unblea'ched sulphite in the beaters subsequent to the, bleaching towers.) Y

Referring again to Figure 1, the magazinev stock or `its equivalent proceeds' from the beater through the system of pipes designated 2 to the cooker tanks y3 which are suppliedv with steam through the pipes 4. In thesemo tanks the steam at 190l degrees bubbles up through the tanks breaking up the stock and de-inking it.

The resultant product passes through the, pipes 5 into thestorage tank 6. It is with!l drawn from that tank through the pipe 7 by the pump 8 which, at the'same time, draws surplus return liquor through the pipe 9 from the rotary screens hereinafter described, y This joint roduct is discharged by the pump 8 through t e pipe 10 into Ythe tank 11 whence it passes through the pipes 12 through the p rifiie tanks 13 which settle out the foreign feature of my process to Vintroduce un" 35 bleached sulphite or unbleached sulphate at material. It then proceeds to the piping system 14 into screen tanks 15 having screensv 16 whence it makes itseirit from the stock box line 17 into the first rotary screen boX 18 fromY which the-waste liquor'goes to waste through through the pipes 23, pump 2li, pipe 25, pipe 26, pump 27, pipe 28 and pipe 9. Bleaching chlorine is introduced through the pipe 29 into the product in the sump 31. |llhe product passes through the pipe 30 into a sump 31. Raw sulphite is beaten in the' beaterV 3210U @stock flows from tower to tower, such as towers 37 38, 39, 40 and 41 by pipes desige nated 42 and thence out to the paper machine can be introduced into the system anywhere through the course of manufacture of the .Y prehend within my invention such modificabj, the pipe 43.

It will be understood that theraw sulphite paper stock. v v

It will also be understood that raw sulphite and raw sulphate are used interchangeably. It will be iuiderstood that I desire to comtions as may be necessary to adapt it to varying conditions Yand uses. .understood that when I say unbleachedsulphite I includepartly bleached sulphite.,

- HavingV thus fully described -my invention, what I claim asnew and desire'to sei eure by Letters Patent, isz--Y L troducing bleach into said stock, introducing Y 1'. In a process of` making paper,disintey grating the stock,- introducing raw sulphite therein and bleaching the stock by adding bleach and passing the stock through a sucp cession of bleaching towels.`

2. In a process of making paper, .disinte-V grating'the stock, introducing raw sulphite therein, bleaching the sto-ck by chlorineV bleach and passing the stock through a succession of bleaching towers.

. 3. In a process of making paper, beating refuse` paper stock, de-inking said stock, in-

raw sulphite into said stock and passing the stock through Va succession of bleaching towers.` i

Y 4. In a process of manufacturing paper from refuse stock, beating the refuse stock,.

cooking it, screening it, introducing bleach into it, introducing raw sulphite into it ,and passing the -sto'ckthrough a succession of bleaching towers. Y l f I' j A 5. In a process of manufacturing paper It will be further e. y Y

' troducing bleach into 1t and introducing raw sulphiteinto'it.

vstock and introducing rawrsulphite into the stock, introducingbleach into the stock, such as bleaching chlorineand passing the stock 'through a succession of bleaching towers.'v

9. Inavr process of manufacturing paper froinrefuse paper stock having relatively short iibers,beating thestock, screening the e stock and `introducing rawsulphite into the stock, and introducing bleach into the stock, such as bleaching chlorine, stirring said stock andfbleaching' with the raw sulphite and passing `.the stock successively from the top to' the bottom of bleaching towers.

10. In the'process of manufacturing paper from refuse'stockybeating the refuse stock,v cooking it to de -ink it, introducing surplus liquor Vfrom previous stock, extracting foreign materialfroin the stock, screening it, in-

11. process of'manufacturing paper from refuse stock, beating the refuse stock,

r cooking it. toA de-inkf.it,,introducing 'surplus liquor from` previous stock, extracting foreign material froin the stock, screening'it, introducing ,bleach into it and introducing raw sulphite .into it, and stirring it with bleach and the raw sulphite. l

`12. In a process'of manufacturing paper Vfrom refuse stock, beating the refuse stock,

cooking it tode-ink it, introducing surplusliquor from previous stock, extracting foreign material from the stock, screening it,in troducing bleach intoit, introducing raw sulphite into it, stirringitwith the bleach andthe raw sulphite, and vgrinding the raw sulphite prior to its'introduction. A

13. Iu: a process of manufacturing paper Y stock from refuse paper, beating the refuse paper into a paper stock having relatively short fibers, beating raw sulpli ite havinor relatively long' fibers, introducing Said beaten products oneinto the other, andintroducing bleach into the combination.

K In testimony whereof, I aiiixl my signature.

Y from refuse stock, beatingthe refuse stock, Y f y cooking it, introducing bleach into it, intro#` ducing raw sulphite into it and passing the stock through a succession of bleaching,

towers.

V6. In a process ofmanufacturing paper, `from refuse paper stock having relatively short fibers, beating the stock, screening the stock, introducing raw sulphite into the stock and passing the-stock'through a succession of .3

'bleaching towers.

' 7.- In a process Y Y vfrom refuse paper stock` havingV `relatively of manufacturing paper :Y

` 8. In a Aprocess of manufacturing papergh ,Y from refuse paper-.stock .having relatively l Y short fibers, beatingthe stock, screening the 

